Bellevue will take center stage in the world of running Sunday, with thousands competing in the Seafair Marathon and other footraces. Many arterials will be closed throughout the city in the morning, and residents and travelers are urged to plan ahead to minimize any inconvenience.

A 5K run/walk begins at 6:55 a.m., the full marathon at 7, a half-marathon at 7:15 and a half-marathon walk at 7:30. Police will be stationed at major intersections, along with scores of volunteers who will assist at uncontrolled intersections.

Lanes and roadways will be opened after runners and walkers pass through the route, as soon as it’s safe to do so. All roadways will be cleared and open to traffic by 1 p.m. To protect everyone’s safety, be patient and obey officers if your way is blocked by runners or walkers.